Observations of vehicle arrival patterns at several points up to 560 M downstream from a traffic signal-controlled intersection have been compared with the theoretical platoon dispersion models suggested by Pacey, Robertson and Seddon. The results showed that none of these distributions gave satisfactory agreement with observed arrivals. A modified form of Robertson's recurrence relationship in which the constant C (by which the average journey time is multiplied in order to calculate the smoothing factor F) was allowed to vary from the value 0.8 so as to be theoretically compatible with the assumed k value did, however, produce much better agreement, although the difference was still statistically significant. For the two positions studied, values of C = 0.625, k = 0.60 and C = 0.59, k = 0.70 provided the best fit to the observed data. /Author/TRRL/

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  • Corporate Authors:

    Printerhall Limited

    29 Newmart Street
    London W1P 3PE,   England 
  • Authors:
    • El-Reedy, T Y
    • Ashworth, R
  • Publication Date: 1978-4

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Filing Info

  • Accession Number: 00184241
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jan 13 1979 12:00AM